A treatise on meteorology; the barometer, thermometer, hygrometer, rain-gauge, and ozonometer with rules and regulations to be observed for their ... and theories of scientific men respecting v
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1866 Excerpt: ...be retained invisibly, and without imparting any sensation of moisture. Mr Glaisher says, of the hygrometer bulbs, that "the simple inspection of the two thermometers will often afford a better criterion of the weather, and of the probability of rain, than the barometer itself; regard, however, being had to the time of the day, and of the year, when the observation is made. "In summer, when the diurnal range of temperature is great, if in the early morning the difference between the air temperature and dew-point temperature be small, and the rise of temperature during the day be considerable, it is probable that the difference will increase; and if the temperature of the dew-point at the same time decrease, it is an indication of very fine weather. "If, on the contrary, the temperature of both should increase, as the day advances, in nearly equal proportion, rain will almost certainly follow, as the air cools with the declining sun. "In winter, when the diurnal range of temperature is small, the indication of the weather is shown by the increase or decrease in the temperature of the dew-point, rather than by the difference between the temperatures of the air and of the dew-point. "In showery weather, the indications vary rapidly; and a person making observations, at short intervals, may predict the approach of a storm, particularly if he take simultaneous observations with the barometer." Monthly Variation of Atmospheric Moisture.--"All months in the year are not equally moist. In London, at Paris, Geneva, and Great St Bernard, the absolute amount of aqueous vapour is at its maximum in January, and its minimum in July; but the relative maximum, in those places, is in December, and the relative minimum in May." This di...
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